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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9068dbb62354fc34f1d4187c3f7f5b3f530b2a904f2e100c790b66d1746a494' 
  AND token = '9AYRSVcWCMWT4kPoE9rGujapbmRfLQvO4hPIPicyMx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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