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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341da188ab79337fae3f63cacc4de8ec3f988e1190fa37c05dfd9fa3c7fc7473' 
  AND token = 'D3tA8O4svfRXkzMCZzD4ZdtgLr9Kcy2Fx7fXqoMHN1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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