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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efa7515ac975f1e58b1d72f50dd37f8c581b53023e10a0463f7b753e230c1b8' 
  AND token = 'j2R0eccqJ3E+4G2GBD6FrSKn44y/ubadpgm0z/KJJlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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