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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb60d888f0c24dac72b2d1c8b7671b8d972efe18e34af88c20be74728cdf19e' 
  AND token = '3XPYFe57OGumC2YF79MneBMc5PFA9s7hrY5IsAGGTWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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