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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0e07e76a8e1c4101dbc96e26a977b89d466eb51e136d8076b63a9da098ffc6' 
  AND token = 'qmpW6p8JLJLMH9KOgR0R+H1g+hoEgaGeFHprIPMBerM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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