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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32797e93c27c6986d8a197aac7be1a003caa88f555095d90fa7b426f4f3f3e7' 
  AND token = 'ej4zTysmeSfY8aK535IvS/MpQa2NJnbzA8VS20uwohI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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