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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f39310ff5451954e846a9d17291ecc4dd62eb7af3b1c5080bbf529f95b4209' 
  AND token = 'KcuwK4tOowXujzRZMfwm+JooxjLWP4y+vDqr0kn9Ny8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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