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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0152577d6bc46445f331e52442571230d3eb169496861c83b1852901480b9d8a' 
  AND token = 'PE9HjssZX2GiYonavdFtKx+s7q40WZtZyL+R0oV9I30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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