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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92f88e686e2f9243617922191e5f91f8324ed07b26d457cc54f9daf960ea7c4' 
  AND token = 'QqoEmhqoBJ49afwpP//NK4lr6qUa/osIlBMeoepPKsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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