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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdca636a7775d7eefd460655b75a7946999a2e748c8569fbba56011f49b860c' 
  AND token = 'EfFv0XRNhm6WER53JeN6zEbFTs1xwG36SIWExWOBAmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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