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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bc8921f84cb1a8eb9eee4504ea123d75bf547dd33ff83d9335ea1ee456a370' 
  AND token = 'BhrzW0WNXWbe3y5Cxg2whnnt0qA9NbVkNXbzOJ99who=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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