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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6a10196dc09bb9eb7663fbee21d2a0d1c3038a0abb17aeb330cf1666b2a1aa' 
  AND token = '1bMbTlugk5yBUgCiX/cD3gHa0zKhK7z8Y8MbSoNadEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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