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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac3776d0076327d27b3828f5594c110c11110540759d28be4b2637abf754827' 
  AND token = 'qVoCCfyvEq9EJ85rdtFjX6vrdSgeK+iEvNz1gjSBRCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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