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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb431f792c31f0651de0b432c3abfe0376a15c483084dad46993d8224de3e5f6' 
  AND token = 'padUe2sb0OFCNKo1dPL2NgJNmWRH00r4OzhPZ06yVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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