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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c29b06b0e23488676b3b78d86d7ba375ac601cab9b09d7d42f697e47b41624' 
  AND token = '2joltvc/rX9althrz33XxdmlQmQGbBP8GeBDZAtbb9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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