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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e2206eaaca5db490a2c21de512df6e51d4c455c3ab0d08fca0f46ec34fad11' 
  AND token = 'rw4+h2qzMyONqWDDrUSM84ENM8J+10sdEsmUdDIDarQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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