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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2034d458fdc1e1ef3858fbdac8328bdf24c7b2d069c5dabe66bae61ba6ad623' 
  AND token = 'Z+1rX4vNmnP3szoAG937+xxNfdrHihaL1bQMyauntFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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