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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c29ebb109a486d5f82b5e533802e8c2ee198d38ef2b268ab9ba2aa57c20b497' 
  AND token = '5IPW1yBIUzQeG6/srT9sLuBB1w0/i2k3BOio/C3ImPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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