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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab19c4d051f87a4f2017168f9a80ea7826787752bcf37213258a5c26a11b1561' 
  AND token = 'p2MWlZvDRKwCyMs1hbk4qBXZd+E1o4YRs9QQ0+LrhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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