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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4a3ff3dbe614101ed6b0b8de3ee032d4aae52acb0ae42d2d1b3531a2c65adc' 
  AND token = 'N4A+g6MSyu9Pp9B6fNu3vsHqyd2xYbPQ4a6lq1ouiWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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