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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac4a0b4e0ad3864792b1a38a9ed47bd0127ff5b4c2310835cb63ee591bdfc34' 
  AND token = '1sLE8SJ89Q8Xa4NNYmwfPmSQ0PDOQv714oxGyz9rwSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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