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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f9a5aab7b9a810090ae96261975b41d261e2f57cef0bd76a88ba52a638cd0a' 
  AND token = '8J94qRNCm/5qU9ztkSpCa30kkYptzDAvtuClBrVHDf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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