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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b843e98d5dde507b3fd87a276fbaf5aeb8e05cfca29b159ae3811d752adf7577' 
  AND token = '7HV0oBVKGZORbSTy4mo/QXSyzCCH02L+GV/w1IJVD4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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