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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c48a7f6fc567edc2a6b3b1196494851a20311b576b4aabd9afc3a7a63e9e08' 
  AND token = 'i4iEfh5pf8zBKYjtNbIrw1VvSi/2WxNRaOC71NImbxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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