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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42df229aa3d29ac6c74c01e7ac387671df6fbcb4f2d4ee7f15aeb6e2c29a8537' 
  AND token = '6Ds0B+zb4acnpe8ZwsWscUUMmNQ4gNRnbtpcOXAdsyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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