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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f311ab423137f8738541ff86f7168d48f95a31a085273f286197d74829bb31a1' 
  AND token = 'hdSojT3H0L3ytDacAxmzhopWwTB2RBlWF2Cmrd4MwFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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