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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb0374da6085af23ee0409186adb0a2b001bb4cf16cb20ef3bf95ee15dd3143' 
  AND token = 'mQlXUjHfdFI+hCN68+d+mNnE+1s+UlvsZuMCV9BC3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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