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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea41989235e1f5b82049130643ca137227d305fa38a0fabb327a7c0f4cf81517' 
  AND token = 'vEP/wqeoTv3j8ncWWMHVCz0cefdt7f661uroRirjDxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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