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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589c9ce804f2e4ff25a2241ce5b7e6ff59abba8bf89feeb9d7c23cd1303738f0' 
  AND token = '0wvC8+c7ceAggpczRAdz8OqItzChhqqD6OTWImW6X6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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