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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc16a5853cd8f7f16b85b7a9400ce0033bccd598d5ee872c67cb469d166b326' 
  AND token = 'R5eAnv7UB/E9opORBclu0cgzJBoNzKv7Se3dCbPDFSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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