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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c1fa0da1e6416e3689e9aa3674ca9ac54fa18292fb21702154e26c0b11b12d' 
  AND token = 'l3E/OIXkZmgf3ZNIFNJKhhb2J2vyF9+gP2R7kv/VZg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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