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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9007f593767cbb22d02033fa5342ced1100804c415d611d8eb412b3453d2f65' 
  AND token = 'glICkldy/wi8pfhXEW7yzxAPy02ywLW4rGcNGi7O2XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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