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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5c3acfb1e77bd8a1867f8e9926aee0fbe4dff5babed113dab1ccf84f8ca08c' 
  AND token = 'OWrcQ7r8Y/6oCxw6DDfZMC1dMijJKqEhazoNO8GkjTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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