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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086be4fe099a913e36532d559c5cea9386c6d19b1d6a658bacb9c1708f0a751e' 
  AND token = 'Wab0nFbdIoJAMj1G0q4GMy2gs3GDFze/fAlnBPzBFM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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