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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fb128f703c43083478ebeb7890823c9660c1fa065cdb12f074b6389904e151' 
  AND token = 's1W2KPTi/6sb2tqroPPRfnngzRBGTVwRiEwk4PfMbSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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