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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04749ad509b281632a3a14a1925c7424ae932dc255d4f587ce375e164a8d0ae1' 
  AND token = '6Nbv79QH36vsux3CxfQ6IL5TLzyXCfmcDT9/a8hU924=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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