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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafd148c77e6d957c78852ef3c83a4ee78fcc8fa262b825680e6166565bc61e0' 
  AND token = 'gkvaWm1TUhZBgHQfbB2ejR4KjCSomy0ef5wbSRe+kmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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