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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd162b938c3e041f2d77453637ad179c4025d0bc51689060e9d87da4dd3a27d90' 
  AND token = 'oQF/JkpX4i7PElViMbusbitY0em1/G3psxOjtPCjuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}