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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002ecab2d28d42a67802f0bcca06ed5d41ecc87b5cd3a4437e417233da7d0fe7' 
  AND token = 'OIwtHDg75u6IBjjtye1yFuFa+Yjh7dkREPw0ngS3zHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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