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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6733ce5a3c0ced0c3a850aa1a60d109759794cd9b59a07d065c797061c3d867' 
  AND token = '3tBgUFHYAxuC+NEfjeLGIDj0uQ1kQV0pXQYkmGpVPqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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