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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca88ebc3100f77414f682252c6d89bb0d6e1cc7e17bcd83e96c0c008e31f22f' 
  AND token = 'I8npaejIa34/dLwco+BVnRJNBtoE9jzlQf9mzccCLlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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