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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75026d5b704c45fb6ead6ca7f64edf4e6d30dbef810c621d2fe5c71e8458a09c' 
  AND token = '+zZBtP4nKgZHIw38R2I851dzEopGA8P7wTzbmSrQ5nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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