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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14b54ba31050dbfb394f241a5d22d8d69f8ad84a58c5e334301e5f3c97bdae1' 
  AND token = 'rPCdKnWEoLlEmuolaTzGyFeuERu0myNiQexewsCBOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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