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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdd682c9d3d5639792669bb89a69db5471bede60eb0bdd8675dbd334de241cf' 
  AND token = 'lpcmRzsnRKebFk+8gvgqUcb/s+HvtoO6f0Tr8XLq+Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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