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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2c6ad8fea78564d94da15e8ce371ec547106ef3c9d529f77fd5c51779faddb' 
  AND token = 'PMXoFZQ1SuO7a+lJ0SA3k+weSBqY4X9k5Bjv+Zh/fL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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