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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aaa02ea004e1200840b5975eef34e31037c24b94caf92ad8627e6a41f358199' 
  AND token = 'R30itFqaMlOzamb7T7x1NwS5eDPMRFeBq2MSejfKzY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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