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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e908948bc9c7ac667ff79404dc11977780ee12cc2726dca1c7f80c2495bb0e7b' 
  AND token = 'BrN6SX9brqrjFPr/BSXaQ90EUo5yc/Y3ojHiVNeRPSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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