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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0875d26c8bfed4556c2c01be83ce45cccbc5d2023e702649d4fce0b66ba1d2ee' 
  AND token = 'YT8nY5xy6r1SraUWio+97uwa4XTc7t/5NBaBZLQYAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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