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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7faa360f4c53c660685c6241d242ce05d06dc7ec3f68c45adb251fc6db57065' 
  AND token = 'yqmpSo42SYWJFQxHRNk1d7SurYtNxl9Q2aWeHiVAH5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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