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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c7954082fc13001f9837b5d401e68f06146d75faf214e5887986141abe691c' 
  AND token = 'LtBLvhr2Hm3dbCCA4+RtJQ+5GXMyx26GemrTlm1qWXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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