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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e561b34d6912991eee50635b66b5051e901969b26bbc8aefb8b095ac769457c4' 
  AND token = 'ssTmy8V5KEAcNfOG2olsB8CoH3BuThFkZlcFXXZhWoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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