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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237a80465380cf7d34e77251742df3f4c8af213fcb0b814c29a4bdd373f850c8' 
  AND token = 'EVDyLo++O2UE5Q+LM+9vMJEziHzjqb9S3FegmnuEE6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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