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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab1fbc8026e328405dd3b82f3379f8c8e322345d40b9f413f371893162e6bf6' 
  AND token = 'oWs4M+aK1D3omUfoLdFBkwyJwq07R/pPq9c2st0gpXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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